Pulp bleaching tower pressure relief hatch

Details Pulp bleaching tower pressure relief hatch Pulp bleaching tower pressure relief hatch

1986-08-20

1987-10-13

Murtagh, John E.

Receptacles

Closures

Closure guided in reciprocating movement

49484, 49485, 52192, 52204, 114201R, 220378, B65D 2300

Patent

active

046992928

ABSTRACT:
An overflow hatch for confining low pressure volumes of paper pulp bleaching chemicals is provided with a double O-ring seal arrangement that sustains the hatch seal integrity as the O-ring material deteriorates from reactive effect of the bleaching chemical. The hatch seal integrity resulting from an annular clearance space extending radially between a cylindrical plug surface and an internal bore of a coaming, where the radial dimension of said annular clearance space is substantially equal to the thickness of a second O-ring tube situated in a seating groove in said plug.

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patent: 2745362 (1956-05-01), Lunde
patent: 3037251 (1962-06-01), Landis
patent: 3401647 (1968-09-01), Ingram
patent: 4004538 (1977-01-01), Schoonman

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